Results 301 to 310 of about 573,006 (357)
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Developments in Vibrator Control
EAGE Vibroseis Workshop - Vibroseis acquisition and processing half century later, new developments in data quality and productivity, 2008ABSTRACTHydraulic limitations, nonârigidity of the baseplate as well as variable characteristics of the ground constantly distort the downgoing energy output by vibrators. Therefore, a real time feedback control must be performed to continuously adjust the emitted force to the reference pilot signal. This ground force is represented by the weighted sum
G. Ollivrin, D. Boucard
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Adaptive vibration control using a virtual-vibration-absorber controller
Journal of Sound and Vibration, 2007A control algorithm emulating a dynamic vibration absorber (DVA) is developed for a flexible structure subject to harmonic disturbances of uncertain frequency. The virtual vibration absorber is mathematically equivalent to a passive DVA, but its stiffness, inertia and damping coefficient are adjustable by software.
Shang-Teh Wu, Ying-Jhe Shao
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Vibration Controller of Marine Electromagnetic Vibrator
2009 International Conference on Measuring Technology and Mechatronics Automation, 2009Marine electromagnetic vibrator is a non-explosive seismic source, for high resolution detection of marine seismic exploration ?which used sublevel sweep mode of marine electromagnetic vibrator. The vibration controller provides sublevel Chirp signal by marine geology condition. The Chirp signal was sent to exciter through power amplifier.
Feng Sun, Zu Bin Chen, Jun Lin
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Vibration and Vibration Control
1990Vibration in machinery and structures is caused by the disturbing forces from, for example, reciprocating masses, unbalanced rotating masses, variable fluid pressure in hydraulic systems, turbulent wind loadings, wave action on structures, ground effects on vehicles, etc.
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Vibrator, vibration unit, and vibrator control method
The Journal of the Acoustical Society of America, 2006A vibrator has massaging balls supported by a treating unit that may be shifted along a subject portion for treatment, guided by guiding members. The treating unit is supported by a supporting structure with respect to the guiding members. A position or orientation altering mechanism is provided for altering the position of the treatment unit in a ...
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Vibration Analysis vs. Vibration Control
SAE Technical Paper Series, 2005<div class="htmlview paragraph">Car manufacturing companies and their suppliers allocate significant human and financial resources to NVH-related R&D. While the most advanced instrumentation and analytical techniques are used for these activities, the incremental improvements of NVH are rather small due to extreme complexity of the ...
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The Journal of the Acoustical Society of America, 1993
To reduce noise inside a motor car passenger compartment, two loudspeakers (371, 372) are driven by signals derived from a reference signal x(n) by adaptive filtering carried out by a programmed microprocessor and memory unit (36) which adapts the filtering in dependence on error signals el(n) from four microphones (421, 422, 423 and 424) distributed ...
Stephen J. Elliott +2 more
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To reduce noise inside a motor car passenger compartment, two loudspeakers (371, 372) are driven by signals derived from a reference signal x(n) by adaptive filtering carried out by a programmed microprocessor and memory unit (36) which adapts the filtering in dependence on error signals el(n) from four microphones (421, 422, 423 and 424) distributed ...
Stephen J. Elliott +2 more
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IFAC Proceedings Volumes, 1987
Abstract It is shown that in addition to closed loop pole placement, vibrational feedback controllers lead, in the sense specified below, to a possibility of open loop zeros assignability. On this basis, the superior performance characteristics of continuous time periodic controllers, discovered in [5]-[8], are explained.
S. Lee, S.M. Meerkov, T. Runolfsson
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Abstract It is shown that in addition to closed loop pole placement, vibrational feedback controllers lead, in the sense specified below, to a possibility of open loop zeros assignability. On this basis, the superior performance characteristics of continuous time periodic controllers, discovered in [5]-[8], are explained.
S. Lee, S.M. Meerkov, T. Runolfsson
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The Journal of the Acoustical Society of America, 1991
A vibration control apparatus of the present invention detects a physical value influencing characteristics of a suspension for supporting a vibrating body and a state value representing movement of the suspension, calculates an optimal target control force in consideration of an external force or disturbance acting on the suspension on the basis of ...
Shunichi Doi +2 more
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A vibration control apparatus of the present invention detects a physical value influencing characteristics of a suspension for supporting a vibrating body and a state value representing movement of the suspension, calculates an optimal target control force in consideration of an external force or disturbance acting on the suspension on the basis of ...
Shunichi Doi +2 more
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The Journal of the Acoustical Society of America, 1997
A vibration control device including a bracket, and a vibration control body. The bracket has a stay portion for connection to an engine, a flange portion formed at one end of the stay portion, and a stabilizer portion to damp large magnitude movements of the body.
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A vibration control device including a bracket, and a vibration control body. The bracket has a stay portion for connection to an engine, a flange portion formed at one end of the stay portion, and a stabilizer portion to damp large magnitude movements of the body.
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